Cause and effect.

Simon ended up using River as a speed bump on his road to the other side of the couch.

River, having had just about enough of Simon's shenanigans for one evening, hopped down from the couch, turned and stared at him then hopped away.  She proceeded to ignore him for the foreseeable future.

Simon tried to interact with his sister only to be thoroughly ignored.  This is his 'I screwed up!' face.
No worries, River eventually forgave him and all was right with the world.
Thanks for visiting the blog and we hope you have a great weekend!  We'll be back on Monday.